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  • 1
    Publication Date: 2008-02-12
    Description: Cells with loss of BRCA2 function are defective in homologous recombination (HR) and are highly sensitive to inhibitors of poly(ADP-ribose) polymerase (PARP), which provides the basis for a new therapeutic approach. Here we show that resistance to PARP inhibition can be acquired by deletion of a mutation in BRCA2. We derived PARP-inhibitor-resistant (PIR) clones from the human CAPAN1 pancreatic cancer cell line, which carries the protein-truncating c.6174delT frameshift mutation. PIR clones could form DNA-damage-induced RAD51 nuclear foci and were able to limit genotoxin-induced genomic instability, both hallmarks of a competent HR pathway. New BRCA2 isoforms were expressed in the resistant lines as a result of intragenic deletion of the c.6174delT mutation and restoration of the open reading frame (ORF). Reconstitution of BRCA2-deficient cells with these revertant BRCA2 alleles rescued PARP inhibitor sensitivity and HR deficiency. Most of the deletions in BRCA2 were associated with small tracts of homology, and possibly arose from error-prone repair caused by BRCA2 deficiency. Similar ORF-restoring mutations were present in carboplatin-resistant ovarian tumours from c.6174delT mutation carriers. These observations have implications for understanding drug resistance in BRCA mutation carriers as well as in defining functionally important domains within BRCA2.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Edwards, Stacey L -- Brough, Rachel -- Lord, Christopher J -- Natrajan, Rachael -- Vatcheva, Radost -- Levine, Douglas A -- Boyd, Jeff -- Reis-Filho, Jorge S -- Ashworth, Alan -- A8363/Cancer Research UK/United Kingdom -- England -- Nature. 2008 Feb 28;451(7182):1111-5. doi: 10.1038/nature06548. Epub 2008 Feb 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Breakthrough Breast Cancer Research Centre, The Institute of Cancer Research, Fulham Road, London SW3 6JB, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18264088" target="_blank"〉PubMed〈/a〉
    Keywords: Aged ; Alleles ; Amino Acid Sequence ; BRCA2 Protein/deficiency/genetics ; Base Sequence ; Carboplatin/pharmacology ; Cell Line, Tumor ; Chromosome Aberrations/chemically induced ; Drug Resistance, Neoplasm/*drug effects/*genetics ; Female ; Fluorobenzenes/pharmacology ; Gene Expression Regulation, Neoplastic ; *Genes, BRCA2 ; Humans ; Middle Aged ; Mitomycin/pharmacology ; Molecular Sequence Data ; Mutation/genetics ; Open Reading Frames/genetics ; Ovarian Neoplasms/drug therapy/genetics ; Pancreatic Neoplasms/drug therapy/genetics/pathology ; Phthalazines/pharmacology ; Poly(ADP-ribose) Polymerase Inhibitors ; Recombination, Genetic/genetics ; Sequence Deletion/*genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2009-12-25
    Description: Multiple somatic rearrangements are often found in cancer genomes; however, the underlying processes of rearrangement and their contribution to cancer development are poorly characterized. Here we use a paired-end sequencing strategy to identify somatic rearrangements in breast cancer genomes. There are more rearrangements in some breast cancers than previously appreciated. Rearrangements are more frequent over gene footprints and most are intrachromosomal. Multiple rearrangement architectures are present, but tandem duplications are particularly common in some cancers, perhaps reflecting a specific defect in DNA maintenance. Short overlapping sequences at most rearrangement junctions indicate that these have been mediated by non-homologous end-joining DNA repair, although varying sequence patterns indicate that multiple processes of this type are operative. Several expressed in-frame fusion genes were identified but none was recurrent. The study provides a new perspective on cancer genomes, highlighting the diversity of somatic rearrangements and their potential contribution to cancer development.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3398135/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3398135/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stephens, Philip J -- McBride, David J -- Lin, Meng-Lay -- Varela, Ignacio -- Pleasance, Erin D -- Simpson, Jared T -- Stebbings, Lucy A -- Leroy, Catherine -- Edkins, Sarah -- Mudie, Laura J -- Greenman, Chris D -- Jia, Mingming -- Latimer, Calli -- Teague, Jon W -- Lau, King Wai -- Burton, John -- Quail, Michael A -- Swerdlow, Harold -- Churcher, Carol -- Natrajan, Rachael -- Sieuwerts, Anieta M -- Martens, John W M -- Silver, Daniel P -- Langerod, Anita -- Russnes, Hege E G -- Foekens, John A -- Reis-Filho, Jorge S -- van 't Veer, Laura -- Richardson, Andrea L -- Borresen-Dale, Anne-Lise -- Campbell, Peter J -- Futreal, P Andrew -- Stratton, Michael R -- 077012/Z/05/Z/Wellcome Trust/United Kingdom -- 088340/Wellcome Trust/United Kingdom -- CA089393/CA/NCI NIH HHS/ -- England -- Nature. 2009 Dec 24;462(7276):1005-10. doi: 10.1038/nature08645.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Wellcome Trust Sanger Institute, Hinxton, Cambridge CB10 1SA, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20033038" target="_blank"〉PubMed〈/a〉
    Keywords: Breast Neoplasms/*genetics ; Cell Line, Tumor ; Cells, Cultured ; *Chromosome Aberrations ; DNA Breaks ; Female ; Gene Rearrangement/*genetics ; Genome, Human/*genetics ; Genomic Library ; Humans ; Sequence Analysis, DNA
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
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